drivers/infiniband/sw/rdmavt/qp.c

/*
 * Copyright(c) 2015 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */

#include "qp.h"

/**
 * rvt_create_qp - create a queue pair for a device
 * @ibpd: the protection domain who's device we create the queue pair for
 * @init_attr: the attributes of the queue pair
 * @udata: user data for libibverbs.so
 *
 * Returns the queue pair on success, otherwise returns an errno.
 *
 * Called by the ib_create_qp() core verbs function.
 */
struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
			    struct ib_qp_init_attr *init_attr,
			    struct ib_udata *udata)
{
	/*
	 * Queue pair creation is mostly an rvt issue. However, drivers have
	 * their own unique idea of what queue pare numbers mean. For instance
	 * there is a reserved range for PSM.
	 *
	 * VI-DRIVER-API: make_qpn()
	 * Returns a valid QPN for verbs to use
	 */
	return ERR_PTR(-EOPNOTSUPP);
}

/**
 * qib_modify_qp - modify the attributes of a queue pair
 * @ibqp: the queue pair who's attributes we're modifying
 * @attr: the new attributes
 * @attr_mask: the mask of attributes to modify
 * @udata: user data for libibverbs.so
 *
 * Returns 0 on success, otherwise returns an errno.
 */
int rvt_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
		  int attr_mask, struct ib_udata *udata)
{
	/*
	 * VT-DRIVER-API: qp_mtu()
	 * OPA devices have a per VL MTU the driver has a mapping of IB SL to SC
	 * to VL and the mapping table of MTUs per VL. This is not something
	 * that IB has and should not live in the rvt.
	 */
	return -EOPNOTSUPP;
}

/**
 * rvt_destroy_qp - destroy a queue pair
 * @ibqp: the queue pair to destroy
 *
 * Returns 0 on success.
 *
 * Note that this can be called while the QP is actively sending or
 * receiving!
 */
int rvt_destroy_qp(struct ib_qp *ibqp)
{
	/*
	 * VT-DRIVER-API: qp_flush()
	 * Driver provies a mechanism to flush and wait for that flush to
	 * finish.
	 */

	return -EOPNOTSUPP;
}

int rvt_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
		 int attr_mask, struct ib_qp_init_attr *init_attr)
{
	return -EOPNOTSUPP;
}

/**
 * rvt_post_receive - post a receive on a QP
 * @ibqp: the QP to post the receive on
 * @wr: the WR to post
 * @bad_wr: the first bad WR is put here
 *
 * This may be called from interrupt context.
 */
int rvt_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
		  struct ib_recv_wr **bad_wr)
{
	/*
	 * When a packet arrives the driver needs to call up to rvt to process
	 * the packet. The UD, RC, UC processing will be done in rvt, however
	 * the driver should be able to override this if it so choses. Perhaps a
	 * set of function pointers set up at registration time.
	 */

	return -EOPNOTSUPP;
}

/**
 * rvt_post_send - post a send on a QP
 * @ibqp: the QP to post the send on
 * @wr: the list of work requests to post
 * @bad_wr: the first bad WR is put here
 *
 * This may be called from interrupt context.
 */
int rvt_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
		  struct ib_send_wr **bad_wr)
{
	/*
	 * VT-DRIVER-API: do_send()
	 * Driver needs to have a do_send() call which is a single entry point
	 * to take an already formed packet and throw it out on the wire. Once
	 * the packet is sent the driver needs to make an upcall to rvt so the
	 * completion queue can be notified and/or any other outstanding
	 * work/book keeping can be finished.
	 *
	 * Note that there should also be a way for rvt to protect itself
	 * against hangs in the driver layer. If a send doesn't actually
	 * complete in a timely manor rvt needs to return an error event.
	 */

	return -EOPNOTSUPP;
}

/**
 * rvt_post_srq_receive - post a receive on a shared receive queue
 * @ibsrq: the SRQ to post the receive on
 * @wr: the list of work requests to post
 * @bad_wr: A pointer to the first WR to cause a problem is put here
 *
 * This may be called from interrupt context.
 */
int rvt_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
		      struct ib_recv_wr **bad_wr)
{
	return -EOPNOTSUPP;
}